North Pacific storm

20°10.9′N 149°43.7′W

Waves left about 23 Oct 11:21Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 250 nmi of it

Its swell was last measured at 46047 (Tanner Bank, CA) on 28 Oct 01:50Z; the replay ends there.

Each buoy places the storm from how its swell's period shortened as it arrived: the longest waves travel fastest. Fronts are drawn at deep-water group speeds along great circles, and stop at land. How it is worked out